Your thyroid regulates metabolism, but it also heavily dictates your nervous system’s tone. When it’s operating in a hyper (high) or hypo (low) state, either direction can signal that something is off!

Low Thyroid Function (Hypothyroidism): When thyroid function slows down, it triggers a physiological stress state. The brain senses something is fundamentally off, which can alter your heart rate and mimic the exact physical symptoms of a panic attack.

Overactive Thyroid State (Hyperthyroidism): While an underactive thyroid triggers a stress response by slowing your system down, an overactive thyroid (hyperthyroidism) throws your nervous system into the fast lane. When your body produces too much thyroid hormone, it continuously overstimulates your sympathetic nervous system (hello fight or flight!). This creates a state of constant physical hyper-arousal that perfectly mimics severe anxiety or panic attacks down to the chest pain, racing heart, shakiness, excessive sweating, racing thoughts, and insomnia. Your brain interprets these intense physical cues as immediate danger, trapping you in a cycle of nervousness and panic that cannot be calmed by deep breathing or mindset work alone.

Poor T4 to T3 Conversion: Your body needs to convert inactive T4 thyroid hormone into active T3. Chronic stress, medications, chronic illness, low calorie diets (under-eating), and low nutrient status from gut dysbiosis can all block this critical conversion.

Elevated Reverse T3 (RT3): When the body undergoes chronic physical or mental stress, severe calorie restriction, infection, or unmanaged conditions like elevated blood sugar, it enters energy conservation mode. Instead of utilizing active hormone for metabolism, it produces RT3. This essentially shuts down metabolism and exacerbates feelings of sluggishness and anxiety.